21155002031432 has 16 divisors (see below), whose sum is σ = 39666227062140. Its totient is φ = 10577341481536.

The previous prime is 21155002031419. The next prime is 21155002031473. The reversal of 21155002031432 is 23413020055112.

It can be written as a sum of positive squares in 2 ways, for example, as 17507077749316 + 3647924282116 = 4184146^2 + 1909954^2 .

It is a super-2 number, since 2×21155002031432² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21155002031395 and 21155002031404.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19377263 + ... + 20439870.

Almost surely, 2^{21155002031432} is an apocalyptic number.

It is an amenable number.

21155002031432 is a deficient number, since it is larger than the sum of its proper divisors (18511225030708).

21155002031432 is a wasteful number, since it uses less digits than its factorization.

21155002031432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39883552 (or 39883548 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 21155002031432 its reverse (23413020055112), we get a palindrome (44568022086544).

The spelling of 21155002031432 in words is "twenty-one trillion, one hundred fifty-five billion, two million, thirty-one thousand, four hundred thirty-two".